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PHP MySQL 讀取資料從 MySQL 資料庫讀取資料
SELECT 語句用於從資料表中讀取資料:
SELECT column_name(s) FROM table_name
如需學習更多關於 SQL 的知識，請訪問我們的 SQL 教程。
以下執行個體中我們從表 MyGuests 讀取了 id, firstname 和 lastname 列的資料並顯示在頁面上：
執行個體 (MySQLi - 物件導向)<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 建立串連
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢測串連
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 輸出每行資料
while($row = $result->fetch_assoc()) {
echo "<br> id: ". $row["id"]. " - Name: ". $row["firstname"]. " " . $row["lastname"];
}
} else {
echo "0 results";
}
$conn->close();
?>
以下執行個體讀取了 MyGuests 表的所有記錄並顯示在 HTML 表格中：
執行個體 (PDO)<?php
echo "<table style=‘border: solid 1px black;‘>";
echo "<tr><th>Id</th><th>Firstname</th><th>Lastname</th><th>Email</th><th>Reg date</th></tr>";
class TableRows extends RecursiveIteratorIterator {
function __construct($it) {
parent::__construct($it, self::LEAVES_ONLY);
}
function current() {
return "<td style=‘width: 150px; border: 1px solid black;‘>" . parent::current(). "</td>";
}
function beginChildren() {
echo "<tr>";
}
function endChildren() {
echo "</tr>" . "\n";
}
}
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("SELECT * FROM MyGuests");
$stmt->execute();
// 設定結果集為關聯陣列
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) {
echo $v;
}
$dsn = null;
}
catch(PDOException $e)
{
echo "Error: " . $e->getMessage();
}
$conn = null;
echo "</table>";
?>
PHP MySQL 讀取資料
